Tweeters in Db Drag

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kfr01

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Posted: March 24, 2005 at 8:16 PM / IP Logged

lol, yes, I know SPL = loudness.

I'm sure you also know that SPL is measured by decibels. A decibel is 1/10 of a bel. Each bel represents a doubling of loudness.

Nothing about this scale is frequency dependent. The same rules that apply for bass apply to treble.

A doubling of power = 3db SPL increase. A 10db increase sounds twice as loud.

Both tweeters and woofers abide by these relationships.

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hoaxs

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Posted: March 24, 2005 at 8:52 PM / IP Logged

so your saying it can work just not as good.

Hurry get me a steel hanger, elec tape, zip ties, a monkey and a snorgle. trust me i've ran wires with less

ss-installer

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Posted: March 24, 2005 at 8:57 PM / IP Logged

it would be hard to get tweeters to pressurize the inside of a car.

Maxst

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Posted: March 24, 2005 at 9:27 PM / IP Logged

It'd make you deaf.

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stevdart

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Posted: March 24, 2005 at 9:27 PM / IP Logged

Oh good, another reference to sound pressure. And an opportunity to ask the question I asked on the first page:

stevdart wrote:

SPL means "sound pressure level", that much I do know. Do they measure sound pressure or do they measure volume in decibels? And if they measure volume in decibels, is it correct to say they are measuring SPL?

kfr01

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Posted: March 24, 2005 at 9:29 PM / IP Logged

ss-installer said: it would be hard to get tweeters to pressurize the inside of a car.

Jesus. NO. High frequency sounds can achieve high SPL too.

Does no one read my posts?

All you need to do to increase SPL is increase power and OR efficiency.

Since tweeters can't handle much power you increase efficiency of the system with MANY tweeters.

HIGH SPL for bass usually = relatively few drivers that can handle extreme amounts of power

HIGH SPL for highs = many multiples of drivers that individually handle low amounts of power

Again. For those of you that can't seem to beat it into your skull. :-)

BASS SPL usually = increase power

TWEET SPL usually = increase drivers

Every time you double power = 3db gain

ALSO

Every time you double the number of tweeters = 3db gain

So, you can achieve the same damn thing with enough tweeters.

Why is this so difficult? Because you can't see the rear view mirror vibrate to highs?

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stevdart

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Posted: March 24, 2005 at 9:43 PM / IP Logged

How many tweets do I need for my amp (SPL question)?
You need this many like this:
Dude, that's what I needed to know. Thanks!
..........uh...uh...but Dude, wont that hert my ears?
It's SPL, who cares?
okey, thanks.
............but, uh....it wont pressurize the cabin!
Good! There's a benefit I didn't think of. Now you won't need your SCuBA gear!

Poormanq45

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Posted: March 24, 2005 at 10:05 PM / IP Logged

kfr01 wrote:

BASS SPL usually = increase power

TWEET SPL usually = increase drivers

Every time you double power = 3db gain

ALSO

Every time you double the number of tweeters = 3db gain

It's not quite that simple. There are alot of factors that determine exactly what the acoustical output increase will be.

Here's a good reading: Cone Area and Power Myths

Actually, it would be easier to acheive high SPL levels with tweeters due to their relatively small size. You can horn load, compression load, a tweeter to get over 110dB at 1w/1m @2.83v.

130dB could theoretically be reached with "only" 128w. Alot of tweeters can handle that power. Now, even though I'm contradicting myself, I'll just say that you could double the number of tweeters to get a 3dB. And again, due to the relatively small size, even with the horns, it would not be hard to acomadate alot of tweeters in a car.

auex

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Posted: March 24, 2005 at 10:06 PM / IP Logged

kfr01 wrote:

Every time you double the number of tweeters = 3db gain

But doesn't the amount of power change everytime you add more speakers???

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stevdart

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Posted: March 24, 2005 at 10:15 PM / IP Logged

poorman wrote:

It's not quite that simple.

It really IS that simple, really. In order to double something you have to already have something that you are going to double. You already have a standard. It doesn't need to be more complicated than that....and

... OH what's this? Poorman, you didn't finish your correction of kfr01................Do I need to read "Cone Area and Power Myths" to figure out what you had in mind?"

auex - sorry I posted before you could edit your question!

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